UK Prime Minister David Cameron has recently set large segments of the world up in arms by deciding to set up a country-wide firewall that will block access to pornography unless citizens opt out. (Similar measures were tried earlier across the EU and summarily thrown out.) But the block apparently won’t be limited to porn: ISPs will also be forced to block violent material, extremist sites, pro-anorexia and pro-suicide sites, alcohol, smoking, web forums (?!) and even… esoteric material.